The invention relates to organosilane-modified polysiloxanes of the following formula: where x=0 to 200, y=5 to 100, z=0 to 50 and p=1 to 25; R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently of one another are saturated or unsaturated, straight-chain or branched alkyl radicals having 1 to 4 carbon atoms and/or aryl radicals having 6 to 9 carbon atoms; R.sup.6 is a straight-chain or branched alkyl radical having 6 to 22 carbon atoms; R.sup.7 is a radical --(CH.sub.2).sub.s-M-Z, where s is 2 to 20, M is an aliphatic group containing at least one --O--CO-- or --CO--O-- group and optionally ether groups, and Z is hydrogen, --CO--CH.sub.3 or a straight-chain or branched alkyl radical having 1 to 4 carbon atoms; R.sup.8 is a radical --(CH.sub.2).sub.n--Si(R.sup.11).sub.v(R.sup.12).sub.3-v, where v is 0, 1 or 2, n is 2 to 16, R.sup.11 is a straight-chain or branched alkyl radical having 1 to 4 carbon atoms, and R.sup.12 is a radical selected from the group OR.sup.13, O--CO--R.sup.13, halogen or haloalkyl having 1 to 6 carbon atoms, in which R.sup.13 is an aromatic radical or a straight-chain, branched or cyclic alkyl radical having 1 to 6 carbon atoms and optionally containing ether and/or thioether groups; and R.sup.9 and R.sup.10 independently of one another possess the definition of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7 or R.sup.8. The invention additionally relates to the use of the organo-modified polysiloxanes for surface coating, and to their preparation.